{\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi} \begin{tabular}     {@{\extracolsep{4pt}}l*{4}{>{\centering\arraybackslash}m{2.6cm}}@{}}      \toprule           & Attendance & Number of hours worked in a day & Share of rejections & Total hourly production  \\          
                    &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         \\
\midrule
Cash $\times$ Post-pay&      -0.003         &      -0.007         &       0.003         &       0.111\sym{**} \\
                    &     (0.014)         &     (0.007)         &     (0.002)         &     (0.047)         \\
\midrule
Control group mean  &       0.983         &       5.265         &       0.013         &       1.582         \\
Include rejections  &                     &                     &                     &           Y         \\
N: worker-days      &       2,967         &       2,917         &                     &                     \\
N: worker-hours     &                     &                     &      17,033         &      17,441         \\
\bottomrule
\end{tabular}
}
